TITLE:
In-Situ Measurements of the Photoconductivity of Multi-Layered Organic Photovoltaic Devices Using Impedance Spectroscopy
AUTHORS:
Ryoji Maeda, Hiroshi Tokairin, Jun-Ichi Takahashi, Yuji Yoshida
KEYWORDS:
Organic Photovoltaic Cells, Impedance Spectroscopy, Modulus Analysis, Photoconductivity
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.5 No.2,
January
30,
2015
ABSTRACT: In-situ impedance
spectroscopy (IS) observations of the photoconductivity of the carriers induced
by photo-irradiation in organic hetero-junction structured photovoltaic devices
are presented. In the IS measurements, the externally applied voltage and the
dependence of the light intensity applied to the device were investigated.
Analysis of the frequency characteristics which was measured by changing the
light intensity shows there is a proportional relationship between the changes
in the conductivities of the two components. The mobilities of the CuPc and C60
layers were calculated from the conductivities and were in the orders of 10﹣4 and 10﹣3 cm2/Vs, respectively.